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utilities to test color capabilities of terminal

Most terminals are capable of displaying 16 colors; 8 colors and 2
different brightness values, some (like xterm) can display more, even
256 colors.

The colortest package includes set of utilities to help test how many
colors a terminal can show. These color settings depend on the $TERM
environment variable and termcap entry and by adjusting or selecting
correct values, higher colors may be available. The following numbers
of colors can be tested for: 8, 16 and 256 colors.